Iraqi Prime Minister Nour al-Maliki is urging the United States to deliver more advanced weaponry, but ISIS fighters have already been seen riding round in U.S.-supplied Humvees in other areas they control, and much of the weaponry captured in this latest battle is likely to be American, experts say. Below are just a few of the images circulating around the web showing ISIS fighters with U.S. military gear following the operation in Mosul. These have not been independently verified.

The first US humvees arrive in Syria, in the hands of ISIS. Captured in Mosul. via @ajaltamimi

Children pose next to U.S. Humvee obtained by ISIS from Mosul. via @EjmAlrai